<template>
  <div class="swiper-container" ref="mySwiper">
    <div class="swiper-wrapper">
      <div
        class="swiper-slide"
        v-for="(img, index) in skuInfo.skuImageList"
        :key="img.id"
      >
        <!-- 点击修改图片默认下标标识，将下标传给zoom -->
        <img
          v-lazy="img.imgUrl"
          @click="changeImgIndex(index)"
          :class="{ active: imgDefaultIndex == index }"
        />
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>
import Swiper from "swiper";
import { mapGetters } from "vuex";
export default {
  name: "ImageList",
  data() {
    return {
      /* 图片默认下标 */
      imgDefaultIndex: 0,
    };
  },
  computed: {
    ...mapGetters(["skuInfo"]),
  },
  methods: {
    /* 修改图片默认下标标识 */
    changeImgIndex(index) {
      /* 当默认下标等于当前图片下标时 active类生效 实现选中高亮效果 */
      this.imgDefaultIndex = index;
      /* 使用全局事件总线 将当前下标传给zoom */
      this.$bus.$emit("changeImgDefaultIndex", index);
    },
  },
  watch: {
    skuInfo: {
      immediate: true, //立即执行
      handler() {
        /* 最后一次DOM更新后 立即触发 $nextTick*/
        this.$nextTick(() => {
          /* 轮播图 */
          new Swiper(this.$refs.mySwiper, {
            slidesPerView: 6, //一行显示几个数据
            slidesPerGroup: 2, //一次移动几个数据
            navigation: {
              nextEl: ".swiper-button-next",
              prevEl: ".swiper-button-prev",
            },
          });
        });
      },
    },
  },
};
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }

      // &:hover {
      //   border: 2px solid #f60;
      //   padding: 1px;
      // }
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;
    &::after {
      font-size: 12px;
    }
  }
}
</style>